Valve heat



N. KOEHN VALVE HEAD FOR AIR ENG'INES Filed oct. 1:5. eze

f INVENTOR ATTORNEY Patented Oct. 29, 1929 I UNITED STATES PATENT OFFICE NATHANIEL KOEHN, OF OAKLAND, CALIFORNIA VALVE HEAD FOR AIB ENGINES Application led October 13, 1926. Serial No. 141,338.

The present invention relates to a valve 7 Within the cylinder 2, and a valve mechahead for air engines and is, in part, divisional nism shown at 8 which is more particularly to my co-pending application, Serial No. described in the co-pending application and 50,661, filed August 17, 1925. In the latter which is constructed to admit air for a presapplication, I described an oscillating air ensure medium into the annular chamber on one 55 gine and a valve head in connection thereside, while exhausting the pressure medium with, the latter being designed to feed a limon the opposite side for swinging the piston ited amount of a pressure medium to the enin one direction, and to be reversed by the pisgine, while the latter was idling and to autoton itself at the end of its stroke for produc- 10 matically increase the pressure medium deing a reverse condition in which the piston 60 livered to the engine upon the attachingof a is actuated in an opposite direction. load thereto. The present invention de- The present invention is principally conscribes a valve head having substantially the cerned with the valve head 9 which admits a characteristic of that described in the said copressure medium to the valve 8. My valve pending application, but having a few struchead comprises a cap 11 formed With a flange tural improvements ineorV orated therein. 12 adapted to be threaded into the cylinder 1. YThe principal object o the present inven- The body portion of the cap is recessed as tion is to provide a valve head that, upon shown at 13, the recess being formed in two manual operation of a valve, will deliver a steps to provide a shoulder 14. A sleeve 16 20 limited amount of a pressure medium and formed with a head 17 thereon has a dia- 70 that will automatically increase the amount phragm 18 ttng therearound, said diadelivered when back pressure is exercised due phram having its periphery clamped against to the assumption of a load bythe engine to the shoulder 14 by means of a fitting ring 19. which the valve head is attached. v A leaf spring 21 bent as shown in Figure 1 Further objectsand advantages of my iniS slipped over the sleeve 16, the sleeve 16 ex- 75 vention will appear as the specification protending thru the central portion of the same, eeeds, and a suit-able facing element 22 serves to The preferred form of my invention is clamp the central portion of the diaphragm illustrated in the accompanying drawing in against the head 17. One end of the leaf Whichspring rests against the inner face of the cap 80 Figure 1 shows a vertical section thru a as shown at 23, while its other end rests on a complete oscillating air engine, having my screw 24 threaded into the head. A reduced valve head attached thereto, extension 26 passes thru a registering hole in Figure 2 is a horizontal section thru the the Spring 21. It will be noted that by operaengine as viewed from line 2 2 of Figure -1, tion of the screw 24, the tension on the spring 85 and l 21 may be increased or decreased. After Figure 3 a top plan view of the entire deinter-position of another facing member 27, vice, a diaphragm 28 is slipped over the sleeve 16 While I have shown onl the preferred and is held in place by means of a nut 29 form of the invention, its ould be underthreaded ontoy the sleeve 16. The rim of the 90 stood that various changes or modifications diaphragm bears against the bottom face of may be made within the scope of the claims the flange 12. A plug 31 is threaded into the heretoattached without departing from the sleeve 16 to form an abutment therein, the spirit of the invention. side of the plug being shaved as shown at The enginel may be 4described as being of- 32 .to allow a pressure medium to pass the 95 the oscillating type and as consisting of a cylplug. inder 2, a shaft 3 arranged centrally therein, The cap terminates at its upper end in a a piston 4 fixed to the shaft made in the shape tubular element 33 which communicates with of a voke and formed with two piston heads the recess 13'thru a comparatively small open- '5 6 adapted to oscillate in an annular chamber ing 34, the tube being sufficiently wide to 100 form a shoulder 36 around the aperture 34. A plug 37 is threaded downwardly into the tube 33 to rest on the shoulder 36 and is formed with a valve seat 38. A second plug 39 is threaded into the sleeve 33 merely to serve as a guide element for the valve 41 which passes thru the latter and is threaded into the plug 37 until it comes to rest on the valve seat 38. The valve 41 consists of a hollow stem with a conical bottom itting the valve .seat 38 and provided with transverse ports 42 adapted to discharge a pressure medium from the inside of the valve 41 inte a space 43 formed in the outer face of the valve 41 by flattening certain portions of the lower end thereof. It will be noted that from this space 43, the pressure medium may escape into the recess 13 and the 'sleeve 16 when Ithe valve 41 is lifted olf its seat 38.

The valve 41 is formed at the lower end thereof and on the inside with a valve seat 44 adapted to accommodate the valve 46 provided at the end of a plunger 47 which latter has suliicient play in the hollow space of the valve 41 to allow ap'ressur'e medium to pass the same and which is normally forced downwardly so as to bring the valve 46 into contact with its seat by a spring 47 bearing at its upper end against a hollow plugY 48 threaded into the valve 41. The valve 46 has a pin 51 extending downwardly therefrom which latter is adapted to be operated bythe plug 31 in the sleeve 16 when the latter is raised due to the fact that a pressure medium bears on the bottom face of the diaphragm 28' Any suitable hose connection 52 may be secured to the valve 41 in the manner shown in Figure 1. A winged element `53 may be fastened to the valve 41 by means of a set screw 54 so that its wings 56 encircle the tubular element 33 and may be secured in any position desired by means of a set screw 57 passing thru one of the wings into contact :j with the outer face of the tubular element 33 which latter may be kn'urled for this purpose, y

The operation of my valveis as follows; To start the engine, the valve 41 is turned slightly by means of the winged element 53 so as to lift the valve off its seat. yThe pressure medium may now enter thru the hose 52 into the hollow of the valve 41 and thru the ports 42 into the spaces 4-3, past thefvalve seat into the aperture 34 and the recess 13 and finally into the sleeve 16 which discharges the saine into the engine for operating the latter. It will be noted that during this operaf tion, valve 46 remains seated and no part of the pressure medium passes thru the latter valve. The pressure supply is very limited and causes the engine toidle at a desired speed, the latter being 'regulated by theextentto which the valve 411s lifted od its seat. /Vhen a load is attached to the engine, as,

for instance, when the shaft 3 is connected to valve to be ground, the pressure within the engine is increased due to the resistance offered by the work and pressure' is brought to bear on the bottom face of the diaphragm 28 which latter is raised thereby. The raising of the diaphragm causes the plug 31 in the 'sleeve 16 to raise the valve 46 oil its seat and the pressure medium can now enter the engine directly thru the bottom of the valve 41 at an increased rate. It will thus be seen that the higher the resistance offered by the Werl; to be done, the more compressed air will enter the engine for driving the same at an increased speed;

YIt will be noted that the action of the diaphragm can be controlled to some extent by adjustment of the spring 21 by means of the screw 24. As the tension ofthe spring 21 is increased, it takes more pressure to ren der the diaphragm active as a valve operating medium and less compressed air will be delivered to th'eengine at a given load. 1f it isu desired to increase the charge, the tension the spring21 should be lessened. Suitable directions for adjusting the tension may be given by the markings on cap 1,1 as 'shown inFigure 3;

l claim; Y j Y 1. A valve fora pressure medium comprising a recessed element having a diaphragm stretched across the recess, a cored member supported in the diaphragm, means for a dmitting a pressure vmedium through the said element to the cored member providing a dou-` ble path for the pressure medium, a manual control for one of the aths and a diaphragm operated control for the secondpath.y

2. A valve for a pressure medium compris-v ing arrecessed element having a diaphragm stretched across the recess, a cored member supported in the 'diaphragm and 'a valve arranged for admitting a pressure medium throughy the element to thecored 'member having; 'means associated therewith tending to close the same and being subject to the action of the cored member for opening the same when back pressure isexercised on the diaphragm, and means independent of the valve for admitting the pressure medium thru the element to the cored member. l Y

3.r A valve for a pressure medium comprising a recessed element having a diaphragm stretched apross the recess, a cored member supported .in `the diaphragm, a valve arranged for admitting a pressure medium through 'the @lenient to the @ered` menih er having means associated therewith tending 'te close the same and being subject to the action of the` cored member-foropening the same when back pressure it exercised on the diaphragm and a bypass for the pressure medium allowing JUh.e\diaph'ragni to become active.

j `4. Ina device of the character described, l13o CII a flanged cap having a diaphragm stretched across the flange thereof, spring means tending to force the diaphragm outwardly, a sleeve supported in the diaphragm and means for admitting a pressure means through the cap to the sleeve comprising a main passage and a by-pass, a manually operated control valve for the by-pass, a control valve for the main passage and an operative connection between the latter valve and the sleeve allowing the latter to operate the former.

5. In a device of the character described, an element having a hollow valve seated therein, and a second valve seated in the hollow of the first valve, manual means for controlling said first valve to permit a pressure medium to be guided from the inside thereof to its seat, and means operated by a diaphragm for controlling the movement of said second mentioned valve.

6. In a device of the character described, a recessed element having a diaphragm stretched across the recess thereof, spring means tending to force the diaphragm outwardly, a sleeve supported in the diaphragm, manually controlled means for admittinv pressure thru said element to said sleeve, an a control valve operated by the -movement of said diaphragm when back pressure is applied thereto for admitting a pressure thru the element to the sleeve, as and for the purpose specified.

7. In a device of the character described, an element having a valve seat thereon, a hollow valve adapted to rest on said valve seat, and a second valve mounted in said first mentioned valve, said first mentioned valve having a valve seat therein adapted to receive said second mentioned valve, manual means for controlling the movement of said first mentioned valve, and means controlled by back pressure on a diaphragm for operating said second mentioned valve.

In testimony whereof I affix my signature.

NATI-IANIEL KOEHN. 

